Java - util package

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Last Updated: 07 April 2025

When we work with Java's HashMap, one common problem occurs that is dealing with missing keys. If we try to fetch a value for a key that doe ...read more

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Optional ofNullable() method in Java with examples

Last Updated: 30 July 2019

The ofNullable() method of java.util.Optional class in Java is used to get an instance of this Optional class with the specified value of th ...read more

Scanner nextLine() method in Java with Examples

Last Updated: 12 October 2018

The nextLine() method of java.util.Scanner class advances this scanner past the current line and returns the input that was skipped. This fu ...read more

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Function Interface in Java

Last Updated: 16 April 2025

The Function Interface is a part of the java.util.function package that has been introduced since Java 8, to implement functional programmin ...read more

Java 8 | Consumer Interface in Java with Examples

Last Updated: 17 September 2021

The Consumer Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programmi ...read more

HashMap containsKey() Method in Java

Last Updated: 04 January 2025

The java.util.HashMap.containsKey() method is used to check whether a particular key is being mapped into the HashMap or not. It takes the k ...read more

Stream anyMatch() in Java with examples

Last Updated: 06 December 2018

Stream anyMatch(Predicate predicate) returns whether any elements of this stream match the provided predicate. It may not evaluate the predi ...read more

Java-Stream interface

Stream filter() in Java with examples

Last Updated: 09 July 2024

Stream filter(Predicate predicate) returns a stream consisting of the elements of this stream that match the given predicate. This is an int ...read more

Java-Stream interface

Stream flatMap() in Java with examples

Last Updated: 11 March 2025

Stream flatMap(Function mapper) returns a stream consisting of the results of replacing each element of this stream with the contents of a m ...read more

Stream.reduce() in Java with examples

Last Updated: 28 August 2024

In Java, the Stream.reduce() method is used to perform a reduction on the elements of a stream using an associative accumulation function an ...read more

Java-Stream interface

Java.util.Random.nextInt() in Java

Last Updated: 21 March 2025

Generating random numbers themselves has a good utility. Java provides a method Random.nextInt() which is the part of Random Class present i...read more

Java

Java - util package

Vector Class in Java

Last Updated: 17 April 2025

The Vector class in Java implements a growable array of objects. Vectors were legacy classes, but now it is fully compatible with collection...read more

Last Updated: 02 January 2025

Hashtable class, introduced as part of the Java Collections framework, implements a hash table that maps keys to values. Any non-null object...read more

Last Updated: 17 March 2025

TreeSet is one of the most important implementations of the SortedSet interface in Java that uses a Tree(red - black tree) for storage. The ...read more

Array vs ArrayList in Java

Last Updated: 24 March 2025

In Java, an Array is a fixed-sized, homogenous data structure that stores elements of the same type whereas, ArrayList is a dynamic-size, pa ...read more

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